已知X=–121，若采用8位机器码表示，则[X]原=（），[X]补=（）
[X]补=（）
| In everyday usage "hot" means "having a
lot of heat". Many people think that "cold" is something completely separated
from heat. But this is not true. "Cold" simply means "having little
heat". Your life depends on heat. In fact, every living thing depends on it. Without heat, every living thing would be frozen to death. All living things get their heat from the sun, which provides the conditions in which life is possible. Since before the dawn of history, man has been able to make his own heat. He has been able to release the sun’s heat that is trapped in things such as wood, coal, and oil. And he has been able to use this heat. Heat has made civilization possible. With heat, man could melt metals. As man learned to use metals and fuels, industries grew. As a result, engines were invented. These are machines that change heat energ A. man can get heat from things like wood, coal, and oil B. man cannot get the heat directly from the sun C. only wood, coal and oil have heat D. all the sun’s heat is trapped in things [单选题](5937)将一段均匀的阻值为R的导线均匀拉长到原来的两倍,其阻值为( )。
A.1/4R B.1/2R C.2R D.4R [简答题]停用电压互感器应注意什么？
[判断题] 更换阀控保护板卡时必须戴上防静电手环,严禁带电时插拔板卡。
A.正确 B.错误 [多选题]包装生产食品安全重要控制点管理制度中所明确:( )为包装生产现场洁净区。
A.灌装区 B.瓶盖处理室 C.洗瓶区 [单选题]浅反射不包括
A.直接角膜反射 B.腹壁反射 C.提睾反射 D.膝反射 E.间接角膜反射 [判断题]承发包工程采取“双签发”时，工作票签发人的职责全部由设备运维单位承担。
A.正确 B.错误 [判断题]《动车组列车服务质量规范》中要求，出、入动车所前，由车辆、客运人员对上部服务设施状态进行检查，办理一次性交接；运行途中，发现上部服务设施故障时，客运乘务人员立即向随车机械师报告，并通知随车机械师共同确认、处理。
A.正确 B.错误 [单选题]第 12 题, 本小题 1 分
下面防止发生带负荷拉合隔离开关事故的措施不正确的是(____)。 A. 停电时按断路器—线路侧隔离开关—母线侧隔离开关顺序操作 B. 送电时按母线侧隔离开关-线路侧隔离开关—断路器顺序操作 C. 严格按调度指令票的顺序执行,不得漏项、跳项,并加强操作监护 D. 严格按调度指令票的顺序执行,可以跳项,并加强操作监护 [判断题]地震三级响应中，震时OCC 行调命令区间列车司机加强瞭望，注意确认车辆运行及设施设备状态，遇异常情况及时采取措施。（ ）
A.正确 B.错误 [多项选择]经注册的设备监理工程师有( )情形的，由原注册登记机构注销注册。
A. 不具有完全民事行为能力的 B. 受行政处分的 C. 因过错造成设备工程重大经济损失的 D. 严重违反职业道德的 E. 脱离设备监理工程师岗位连续满一年的 [多选题]排烟防火阀设置场所：（ ）
A.排烟管在进入排风机房处 B.穿越防火分区的排烟管道上 C.排烟系统的支管上 D.送风管道进入设备区房间处 E.电缆井内排烟管道 [简答题]空调主机接有哪些？
[判断题]智能变电站二次回路接线或虚端子配置变更的要求如下:修改配置文件应遵循“过程修改，源端受控”的原则，严格按照修改、校核、审批、执行的管理流程开展工作。
A.正确 B.错误 [单项选择]以下属于汽车产品外观性能的是（）
A. 油耗 B. 速度 C. 款式 D. 爬坡 [多选题]信号系统能反映“ ”状态，提醒运行人员注意。（）
A.正常运行 B.控制系统 C.不正常运行 D.事故 [单项选择]Regardless of the source or kind of light, the ability of light to form an image is dependent upon just one thing--a small hole or a lens to bring the rays to a focus. The principle of image formation was discovered in early Greek Times. Later it was realized that the eye itself has a lens and that an image is, in fact, formed on the retina, the rear inside surface of the eyeball. Some man inside a cave or a darkened room noticed that light entering through a small hole in the wall formed an image on the far wall. It was observed that if you enlarge the hole, the image blurred and disappeared. On the other hand, the smaller the hole, the sharper the image-down to a certain diameter after which making the hole smaller makes the image worse again.
The function of a pinhole is to screen out all light rays except those coming in a perfectly straight line from the object, thus improving the sharpness of the image. After passing through a point the rays again spread out a little bit, an A. the development of the lens B. that both operation on the same principle C. how the early camera operated D. how primitive scientific thinking was, prior to the 16th century [多选题]在处理涉及学生伤害事故纠纷时,下列说法正确的是( )
A.如果法律先后有两种提法,一般以后制定的法律为准。 B.学校与学生之间的问题,应该以教育部制定的规章为准。 C.如果法律与政策有不同提法,应该以相关政策为准。 D.如果法律与政策有不同提法,应该以相关法律为准。 [多选题] 意志缺乏的临床症状包括( )。
A. 精神活动不协调 B. 自知力不完整 C. 缺乏应有的主动性 D. 生活极端懒散 我来回答: 提交
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